Geochemistry and age of groundwater in a hydrochemically diversified aquifer (Permo-Carboniferous, the Intra- Sudetic Synclinorium, SW Poland) derived from geochemical modelling and isotopic studies

作者: Dariusz Dobrzynski

DOI:

关键词: DolomiteStable isotope ratioAquiferRadiocarbon datingMineral waterGeologyGeochemistryCalciteSedimentary rockGroundwater

摘要: Comprehensive investigations of groundwater were performed in a sedimentary aquifer Permo-Carboniferous, Intra-Sudetic Synclinorium, SWPoland. The investigation included aqueous chemical and isotopic composition, chemistry mineral phases, geochemical modelling, tritium radiocarbon dating. Chemical diversity the system is created by mixing modern fresh water older sulphate with higher dissolved solids. treated as flows two end-member types. Geochemical modelling used for: (1) explaining origin chemistry both components, (2) quantifying the groundwater mixing, (3) correcting age for effects water-rock interactions, (4) calculating reaction rates. Study stable (C, S, O, H) unstable ( 3 H, 14 C) isotopes allowed the inverse mass balance models to be verified specified, dated. The modern, tritium-bearing, result dissolution limestones, dolomites and gypsum. mean tritium-age this water, based on lumped-parameter approach, varies between 10 and 200 years. owes its process dedolomitization driven gypsum dissolution. Its about 5.9 ka BP, i.e., during Mid-Holocene Climatic Optimum. Rates of reactions responsible formation type are estimated be: gypsum (2.85 μmol/L/year) dolomite (0.21 μmol/L/year), calcite precipitation (0.20 organic matter decomposition (0.08 μmol/L/year).

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